Police tragically told to search for Spider Man outfit toddler William Tyrrell was wearing on the day he disappeared... as person of interest's son claims his father has been unfairly targeted since little boy went missing

Police told to specifically look for the three-year-old's Spider-Man suit

It may have been his most treasured piece of clothing, but the blue and red Spider-Man suit that William Tyrrell was wearing on the day he disappeared is now the key focus in a search for the remains of the missing toddler.

That was the tragic news on Tuesday night as police confirmed they were specifically now searching for the outift on isolated waterways in bushland on NSW's mid-north coast after the latest stage of the search proved fruitless.

The change in tact in the long-running investigation comes as the son of tradesman Bill Spedding - a person of Interest interest in the case - claimed his father was being unfairly harassed.

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Detectives returned to the home of the person of interest in the case of missing toddler William Tyrrell shortly after he drove past the new search site

More than 30 police officers began a heartbreaking search on Monday morning for the remains of William Tyrrell in dense bushland about 20km from where the three-year-old vanished almost six months ago

Homicide Squad Detective Inspector Gary Jubelin said, as well as trying to find the Spider-Man costume, part of combing for evidence included looking for a body.

'The question has been asked 'does that include a body' and of course when we are looking for evidence that would also include a body,' he said.

While the items seized at the search zone weren't believed to be linked to William's disappearance almost six months ago, they have been sent off for testing.

'But we are erring on the side of caution and we will conduct tests on those items,' DI Jubelin said.

DI Jubelin revealed almost 1000 people had spoken with police over the course of the probe.

MeanwhileThe Sydney Morning Herald reports that Rodney Spedding said his father had been unfairly harassed by the media, even though a number of other homes and properties had been searched by police – some up to three times, he believed.

'He's got the biggest heart, he's very generous. Bill has our full support, and [has] no link to the disappearance," Mr Spedding told Fairfax Media on Tuesday afternoon.

'I feel very upset, it's upsetting. The media attention has killed his business, and it's affected his livelihood.'

Detectives returned to the home washing machine repairman Bill Spedding shortly after he drove past the new search site.

A few minutes after Mr Spedding left his home (pictured) the head of the investigation, homicide Detective Inspector Gary Jubelin, was seen arriving at his house

On Monday Mr Spedding said he was aware of Monday's police search

Mr Spedding was spotted driving his van past the search site for the three-year-old's body on Houston Mitchell Drive in Bonny Hills on the NSW north coast on Monday morning,The Daily Telegraph reported.

A few minutes after Mr Spedding left his home the head of the investigation, DI Jubelin, was seen arriving at his house, the Sydney Morning Herald reports.

William Tyrrell went missing from his grandparent's backyard in Kendall, south of Port Macquarie, on the NSW mid-north coast.

Bones were found on Monday in the in dense bushland during the search for the little boy's body, which involved more than 30 police officers, but a pathologist confirmed the remains belonged to an animal.

NSW Public Order and Riot Squad Police continue their search for evidence of missing boy William Tyrrell

Police ride on the back of a police vehicle as they search bushland for remains on Tuesday

Up to 30 Police are searching dense bushland for the missing three year old toddler

Mr Spedding was called to fix William's grandmother's washing machine on September 12 last year - the same day that the youngster vanished from her home wearing a Spiderman outfit.

Mr Spedding was questioned and released without charge after police searched a set of rooms under his home, excavated part of the backyard and drained the septic tank of the property.

Police are conducting a search of the site between Bonny Hills and Lake Cathie by hand and have vowed to find out what happened to the adorable youngster after revealing they have received 'fresh information' on the mysterious case.

Police searched a set of rooms under the home, excavated part of the backyard and drained the septic tank of William Spedding's Bonny Hills property. He was questioned and released without charge

On Monday Mr Spedding told the Daily Telegraph he was aware of Monday's police search: 'It's quite surprising... they're only doing their job.'

In January, he told Channel Nine of the raid on his home: 'It has been very difficult. I wish to thank our family, our friends for the overwhelming support that we have received from them over this time.'

Det Supt Willing would not be drawn on whether Monday's search was related to the search of Mr Spedding's home.

'We are conducting a range of inquiries, I don't want to talk about specifics or specific people, but this information is general in nature and it's recently received and information that has come from inquiries conducted by detectives that has led us to search this area,' he said.

The latest information comes just after the search took an international turn, with authorities in dozens of far-reaching countries expected to join the cause.

NSW Crime Stoppers have urged Crime Stoppers websites in 26 countries to post a message about William's abduction last year, urging anybody with information on the case to contact Australian police.

The parents of missing three-year-old William Tyrrell broke their silence by issuing a heartbreaking letter revealing William's Spiderman toys remained untouched since he disappeared in September

His parents say walking past his bedroom is painful beyond words and they desperately want their little boy home where he belongs

The plea has been sent to places as far-flung as Europe and America, urging them to post articles about three-year-old William, who went missing from his home in grandmother's home on the NSW north coast on September 12, reports the Sunday Telegraph.

NSW Crime Stoppers CEO Peter Price said they're expecting a plethora of further countries to jump on board.

'If you were in the area and did not come forward, we would have grave concerns and a certain amount of suspicion would be attached.

'It's a huge coincidence that you have a situation where a young boy has been unsupervised, only for a very short moment, and someone has come into contact with him at the time,' he told AAP, noting how quiet the street is.

After five long months of investigation, police say that William was abducted and did not simply wander off and become lost from his grandmother's home

To reinforce the point police believed the three-year-old was abducted Inspector Jubelin described it as a 'ground zero operation' and that they were basically starting the investigation from scratch again.

He maintained that police would now 'consider every possibility' and 'everyone's a suspect'.

As opposed to a normal appeal for public information, anyone who fits the criteria and doesn't come forward will attract police suspicion.

'If they don't come forward to police, we would have some concern and attach a certain amount of suspicion to anyone that doesn't want to help police in an investigation of this nature,' Det Insp Jubelin said.

Detectives haven't ruled out the possibility that the person responsible for abducting William loitered outside his grandmother's home before snatching the three-year-old as soon as he was alone

Meanwhile concerned locals and two psychics have joined the hunt for the abductor in Australia's most baffling missing child case, sending police a photograph of a mystery man and a drawing of the possible kidnapper.

The photograph of a man with folded arms standing near police, described as 'pale, lanky and walks with a limp', has emerged as fresh evidence in the search.

The local searcher who photographed 'the man with the folded arms' decided to speak out but as the mystery of missing toddler entered its fifth baffling month.

She sent a photograph of the man to police late last year, but has not heard back. A psychic has also hand drawn a cryptic picture of the man she believes may have abducted William.

This was the scene of the search for missing William Tyrrell near Kendall on the NSW Mid North Coast last September for nine days after he went missing

NSW Mid North Coast locals (pictured) join in the search last September for missing William Tyrrell

While NSW police would not confirm whether they were working on leads from the clairvoyants, police around Australia have a long history of working with clairvoyants on missing persons and murder cases.

Mid North Coast locals assembled on day one of the search for William after he vanished on September 12 from his grandmother's home at Kendall, 35km south of Port Macquarie, say five months on they still want to help in the search for the little boy.

William was wearing his favourite Spiderman costume and playing with his younger sister in the yard at their grandmother's home during a visit to Kendall with their mother from Sydney, when he disappeared.

Fears that the little boy may have wandered off into the bush gave way to graver doubts as police scoured fields, dams and roads through the nearby forest for clues.

This is the street where William Tyrrell was visiting his grandmother when he vanished last September

Police and SES volunteers scoured the bush and forest for clues to William Tyrrell but found nothing

Kendall's tiny community rallied around William's desperate family and Mid North Coast residents turned up to help with the search.

A command post was set up and volunteers provided food for the searchers. AS the days rolled by, police admitted William's chances of survival if he had wandered off alone were slim.

They widened the search, theorising that the boy may have been thrown from a vehicle after being abducted.

Police Strike Force Rossann engaged hundreds of volunteers in the search of bushland around the home for any sign of William.